NiFe LDH Anchoring on Fe/N-Doped Carbon Nanofibers as a Bifunctional Electrocatalyst for Rechargeable Zinc–Air Batteries

• Published in: Industrial & engineering chemistry research 2022-06, Vol.61 (22), p.7523-7528
• Main Authors: Wu, Dan, Hu, Xiaolin, Yang, Zuguang, Yang, Tongxin, Wen, Jie, Lu, Guanjie, Zhao, Qiannan, Li, Zongyang, Jiang, Xiaoping, Xu, Chaohe
• Format: Article
• Language: English
• Subjects: Materials and Interfaces
• ISSN: 0888-5885; 1520-5045
• DOI: 10.1021/acs.iecr.1c04694

Challenges remain for the preparation of high-performance rechargeable Zinc-air batteries (ZABs). Herein, we propose a bifunctional electrocatalyst (NiFe LDH@Fe-N-CNFs) constructed by NiFe LDH growing on Fe- and N-modified carbon nanofibers. The NiFe LDH@Fe-N-CNFs with a cross-linked network nanostructure possess abundant Fe-N-C reactive locations in Fe/N-codoped carbon nanofibers and ultrathin NiFe LDH nanosheets, which could greatly enhance ORR/OER activities. Importantly, the assembled ZABs triggered by the NiFe LDH@Fe-N-CNFs electrocatalyst exhibits a high capacity of 695.2 mA h g–1. An energy density of 838.6 Wh kgZn –1 and an outstanding stability of 184 h at 10 mA cm–2 are demonstrated. The superior performance of NiFe LDH@Fe-N-CNFs bifunctional electrocatalysts benefits from the synergy between Fe/N-modified carbon nanofibers and ultrathin NiFe LDH nanosheets with respective ORR and OER active sites. This work affords a rational design principle and strategy to design the bifunctional electrocatalyst.